The silk lining provides warmth, absorbs and releases moisture to prevent stuffiness and odor, and offers a comfortable, dry feel. Wearing these socks helps prevent dry, rough heels. Recommended for those concerned about cold feet and body! Outer fabric: Acrylic, wool, nylon, polyurethane Inner fabric: 100% silk Size: 22-24cm Sock type: Room socks Pattern/Design: Solid Color: Gray Sock length: Short/Ankle length Stored item. When shipping, the box will be disassembled and tilted, and the socks will be placed in a separate bag. Japan Socks Association Made in China #silk #Double knit